Derby, Iowa

Derby fell from 115 to 90 between 2010 and 2020. These are the recorded population figures Wikidata holds for this place, reached through the Geographic Names Information System number this page is keyed on rather than by name, so they belong to this place and not to another of the same name. Most are census counts, but not all are: an early figure may be a founding or settlement estimate, and an estimate published within five years of a census is left out. The change column is computed, and is left blank where more than 20 years separate a figure from the one before it, because a gap that long is not a change between two counts.

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1934 USGS Corydon quadrangle1:62500, 2 printings
• 1934 USGS Humeston quadrangle1:48000
• 1937 USGS Corydon quadrangle1:62500, 2 printings
• 1954 USGS Centerville quadrangle1:250000, 3 printings
• 1957 USGS Centerville quadrangle1:250000
• 1958 USGS Centerville quadrangle1:250000
• 1981 USGS Leon quadrangle1:100000
• 1982 USGS Derby quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 25 fires within 5 miles of Derby between 2006 and 2019, burning about 706 acres in total. None started naturally. None was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Settlements close enough to share some of these fires:

• Last Chance
• Lucas
• Troy (historical)
• Zero

Every fire recorded in Lucas County

Regional context, not property-specific evidence. The National Weather Service names Derby in 18 storm reports between 1994 and 2024: 5 hail, 4 thunderstorm wind, 4 heavy rain, 3 tornado. The reports record 1 death and 1 injury. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

Every storm recorded in Lucas County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 455887. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.